#include <stdio.h>
#define N 15

int main(){
    int i,number,top,bott,mid,loca,a[N],flag=1,sign;
    char c;
    scanf("%d",&a[0]);
    i=1;
    while(i<N){
        scanf("%d",&a[i]);
        if(a[i]>=a[i-1]) i++;
        else printf("enter this data again:\n");
    }
    printf("\n");
    for(i=0;i<N;i++) printf("%5d",a[i]);
    while(flag){
        scanf("%d",&number);
        sign=0;
        top=0;
        bott=N-1;
        if((number<a[0])||(number>a[N-1])) loca=-1;
        while ((!sign)&&(top<=bott))
        {
            mid=(bott+top)/2;
            if(number==a[mid]){
                loca=mid;
                printf("has found %d, its position is %d\n",number,loca+1);
                sign=1;
            } 
            else if(number<a[mid]) bott=mid-1;
            else top=mid+1;
        }
        if(!sign||loca==-1) printf("cannot find %d\n",number);
        printf("continue or not(Y/N)?");
        scanf("%c",&c);
        if(c=='N'||c=='n') flag=0;
    }
    return 0;
}